Player to watch – Cedric van der Gun: Will add some much-needed experience to what is likely to be a young side and has done well when given the chance this season.

Referee: Nigel Miller (County Durham).

Form Guide: Swansea beat Barnet and Tranmere on their way to the third round and have recorded two straight wins in the Championship. Peterborough beat Rotherham and Cardiff in rounds one and two and have won three of their last four in the league.

Bookies’ Odds: Peterborough 9/5, Draw 23/10, Swansea 6/4

Tim Lewis’ verdict: Not an easy place to go for the Swans but I’d still back them to progress, could all depend on how strong a team Brendan Rodgers puts out. A 1-2 away win.